The reconciliation between LG and Samsung following their 18-month-long feud over OLED patents looks to be over, after LG Electronics instructed its rival to pay for its use of the technology, claiming Samsung Electronics and Samsung Display have violated its patents.

The company’s insistence that Samsung pays for the use of its OLED technology — which is used for screens in TVs, phones and more — looks set to reopen the feud that began when 11 of its staff members were accused of leaking confidential secrets to Samsung in 2011.

Things had reached the point that there was, perhaps premature, talk of the potential to cross license the patents at the center of the dispute. Now, with LG now demanding compensation and pointing the finger, such co-operation is looking unlikely.

LG was awarded patents for eye-tracking technology in 2009, but Samsung claims it is using a different system that does not infringe on its rival. LG has vowed to take a close look at the Galaxy S4 when it is released next month.